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An observatory-quality astroimaging setup is well within your reach with Celestron’s CGE Pro HD. Our flagship mount, CGE Pro is a rock-solid base for up to 90 lbs of payload, including Celestron’s 14-inch EdgeHD optical tube. Feel free to add accessories, guidescopes, CCD cameras, filter wheels, and more; CGE Pro’s motors and 3-inch tripod legs will handle the load with ease. Our 11- and 14-inch CGE Pro HD telescopes feature all of Celestron’s key technologies, including All-Star Polar Alignment, SkyAlign, StarBright XLT optical coatings, Fastar compatibility, and more. Paired with our EdgeHD optical tubes, you’ll get the best telescope system Celestron has to offer, at a surprisingly affordable price.
The CGE Pro 925 HD combines Celestron’s state of the art CGE Pro Computerized Equatorial mount with its new EdgeHD optical system. With over 9 inches of aperture and our premium StarBright XLT coatings, the CGE Pro 925 HD gives you over 1000 times the light gathering power than the unaided eye.
New Optical Design
The EdgeHD optical system takes all of the compact power popularized by the Schmidt Cassegrain Telescope (SCT) and combines it with an improved high definition optical system for wide field, astrograph quality images.
As a visual instrument, EdgeHD optics deliver pinpoint images even with your widest field eyepiece. You can search for all of the Messier Catalog objects, and see hundreds of other equally interesting NGC, IC and Caldwell objects with amazing clarity. For astroimaging, the EdgeHD optics produce aberration-free images across your favorite CCD or DSLR camera. All EdgeHD optics are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of the largest commercial CCD detectors, allowing all stars to be in tight focus to the very edge of the chip.
EdgeHD Whitepaper
The Celestron Product Development team has released a whitepaper outlining the technology behind EdgeHD. This paper describes the development goals, design decisions, optical performance, and their practical realization in 8-, 9.25-, 11-, and 14-inch apertures. We include cross-sections of the EdgeHD series, comparative spot diagrams for the EdgeHD and competing “coma-free” Schmidt-Cassegrain designs, a table with specifications for visual and imaging, graphics showing how to place sensors at the optimum back-focus distance, and details on the construction and testing of the EdgeHD telescope series.
Click here to download the whitepaper.
Diffraction Limited
Some companies boast that their telescopes give diffraction limited stars in the very center of the field of view. EdgeHD optics not only produce diffraction limited stars on axis, but maintain diffraction limited stars across the entire field of view of many of the most popular astrophotography cameras. Even at the very edge of a full frame camera chip, the EdgeHD 9.25 delivers diffraction limited stars of only 1 arc seconds.
The EdgeHD 9.25″ optics produces a focal plane almost 9 times flatter than the standard equivalent SCT telescope with diffraction limited stars across the entire SBIG STL11000 field of view!
Along with the newly designed optics, the EdgeHD also has re-designed mechanics guaranteed to help you get the maximum performance from your instrument.
Features Include:
Mirror Locks – To hold the mirror in place and reduce image shift during imaging.
Tube Vents – Each vent has an integrated 60 micron micro-mesh filter allowing hot air to be released from behind the primary mirror.
Fastar Versatility – All EdgeHD optical tubes are equipped with a removable secondary mirror for fast f/2 CCD imaging. Not only does imaging in the FASTAR configuration allow for exposure times that are 25 times faster than at f/10, but also yields a field of view five times wider. A perfect combination for imaging your favorite wide field objects in a fraction of the time. (FASTAR imaging requires a third party lens assembly in place of the secondary mirror).
Axiom Eyepiece – EdgeHD 9.25″ optical tubes come with Celestron’s top of the line Axiom eyepiece. With a 23 mm focal length and 82° AFOV, you get an incredible combination of power and wide field of view. Plus each Axiom eyepiece is optimized to deliver pinpoint images when used with a flat field telescope.
Learn more about the benefits and features of this new optical system by going to the EdgeHD web page.
CGE PRO Mount
In addition to being fully computerized with a database of over 40,000 celestial objects, the CGE Pro German Equatorial mount has been completely redesigned to offer numerous design advantages:
CGE PRO Tracking Data
The following graphs display R.A. worm gear tracking accuracy of the CGE Pro Equatorial mount in 4 conditions: Figure 1 – Raw unguided tracking that isolates the periodic error; Figure 2 – Tracking with Permanent Periodic Error Correction (PPEC) enabled; Figure 3 – Guided tracking with an autoguider; and Figure 4 – Guided tracking with an autoguider and PPEC enabled. Data was acquired from Celestron’s engineering team using an EdgeHD 800 optical tube and NexImage camera at f/10. This data represents the typical performance of a CGE Pro under average seeing conditions from urban skies in Torrance, CA. Figure 2 has a cubic fit applied to the graph, and Figures 1, 3 and 4 have linear drift removed (to better show repeatable error). All Figures show 22 minutes of tracking, which covers 4 full rotations of the CGE Pro R.A. worm gear.
Figure 1. This graph displays the R.A. worm gear tracking accuracy for a typical CGE Pro equatorial mount. The graph shows 4 periods of the worm gear which yields about +/-7 arc seconds of periodic error. The minimal periodic error is both very predictable and gradual, allowing short unguided images to be taken, or much longer exposures with extremely accurate tracking when used with an autoguider.
For more information about Celestron’s new mount, go to the CGE Pro mount web page.
Optical Design | EdgeHD |
---|---|
Aperture (mm) | 235 mm (9.25 in) |
Focal Length | 2350 mm (93 in) |
Focal Ratio | 10 |
Focal Length of Eyepiece 1 (mm) | 23 mm (0.91 in) |
Magnification of Eyepiece 1 | 102 x |
Finderscope | 9×50 |
Star Diagonal | 2″ |
Mount Type | CGE Pro Computerized Equatorial |
Tripod | Adjustable, 2.75″ Stainless Steel legs |
Power Requirements | Car battery adapter |
Highest Useful Magnification | 555 x |
Lowest Useful Magnification | 34 x |
Limiting Stellar Magnitude | 14.4 |
Resolution (Rayleigh) | 0.59 arc seconds |
Resolution (Dawes) | 0.49 arc seconds |
Light Gathering Power (Compared to human eye) | 1127 x |
Apparent Field of View | 0.8 ° |
Linear Field of View (@1000 yds) | 28 ft (8.53 m) |
Secondary Mirror Obstruction | 3.35 in (85 mm) |
Secondary Mirror Obstruction by Diameter | 36% |
Secondary Mirror Obstruction by Area | 13% |
Optical Coatings | Starbright XLT Coating |
Optical Tube Length | 22 in (559 mm) |
Optical Tube Weight | 21 lbs (9.53 kg) |
Counterweight Bar | 5 lbs (2.27 kg) |
Weight of Counterweights | 1 x 22 lbs |
Slew Speeds | Nine slew speeds 5.5 deg/s, 2 deg/s, 0.5 deg/s, 64x, 16x, 8x, 4x, 1x, 0.5x |
Tracking Rates | Sidereal, Solar and Lunar |
Tracking Modes | EQ North and EQ South |
Alignment Procedures | 2-Star Align, Solar System Align, Last Alignment, Quick Align, 1-Star Align |
Database | 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects |
Internal Clock | Yes |
GPS | Optional SkySync GPS Accessory |
Warranty | 2-year Telescope Warranty |
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